Migration Between Microsoft 365 Tenants: Practices and Tips

Migrating from one Microsoft 365 tenant to another can be a complex process that requires careful planning and execution. Whether you are merging two companies, consolidating your IT infrastructure, or moving to a new region, there are several steps you need to take and factors you need to consider before you begin the migration process.

Tips for Migration between Microsoft 365 Tenants

Migration between Microsoft 365 Tenants is very complex task if done manually. Manual process requires performing some prerequisites in both source and target tenant. Below are some practices that one should consider while performing Tenant to Tenant Migration.

Planning Your Migration

Before beginning the migration process, it’s essential to plan out the entire project. This includes identifying all mailboxes and data sets that will be migrated, determining which services will be transferred over (such as SharePoint sites or OneDrive for Business data), and establishing timelines for each phase of the project.

It’s also important during this planning stage is finding out if there are any specific compliance requirements that must be met during this move. You may also have customizations that require consideration. Once all relevant information has been gathered identify potential issues early on so solutions can be planned accordingly before encountering them while in progress later on.

Setting Up Your Target and Source Environment

To migrate data into an existing Microsoft 365 tenant without causing disruption requires creation of new empty target environment with all necessary licenses, security configurations & user accounts are set up according to needs. Some prerequisites should be performed before starting the migration in both source and the target tenant.

Azure Portal configuration (App Registration)

To ensure the successful migration of mailbox, app registration should be done. It is necessary to create relationship between source and the target tenant. After app registration, you must provide mailbox move permission in that application, create a secret value and provide admin consent for the application.

Testing Before the Migration

Testing should be done to check if everything you had did till now is correct or not. You can test the complete process by running the PowerShell Command. If everything is fine, it will show the result as success. But if something is wrong, you might see the result as failed. If the result is shown as failed, you need to check where you did the mistake or you may need to perform the process from the start.

Migrating Mailboxes 

One of most essential components in any Office 365 tenant is mailbox content which typically means large-scale mailbox migrations requires third-party migration tools or services for fast data migration. Always perform migration in batches for quick data transfer from one tenant to another in Microsoft Office 365. Also you can check out this article on Office 365 Tenant to Tenant Migration for manual process. This process requires to run PowerShell commands to perform the migration tasks.

While migrating mailboxes, set up priority and which mailbox batches will be migrated first, second and so forth. It’s recommended to create a list of priority user account which includes top level executives or high-profile users with critical data in their email accounts. You can contact CloudBik with your mailbox migration requirements.

To migrate user mailbox from Google Workspace, you can check out this link for Google Workspace to Office 365 migration. It will help you in migrating mailbox content like emails, contacts, calendars and rules. Manual process for migrating to Microsoft 365 from Google Workspace is not very difficult but it requires some tasks to perform before migrating the data like adding domain, creating users, assigning license, etc. It is recommended for small organizations looking for migrating small quantity of users. Migrating large number of users using manual process is not recommended as it takes lots of time. The better option for migration of users in bulk is by using third-party services.

Moving OneDrive Data

OneDrive for Business is an essential storage feature offered by Office 365 making it necessary to move data in an efficient manner. The process involves migration of data from one OneDrive for business to another. You can use mover.io, that is absolutely free but you need to migrate users one by one.

Testing & Verification

After testing everything on the test tenant now it’s time test again everything on production with few test users. It’s important to verify that all data has been transferred successfully and that users can access their emails, files, and other resources in new tenant space promptly after migration is complete.


Migrating from one Microsoft 365 tenant to another requires meticulous planning coupled with careful execution. Ensuring all relevant information has been considered before beginning migration process saves time later on if issues arise unexpectedly. Make sure everything is setup correctly to avoid any data loss or errors. By following the above steps during the migration process, organizations can make a smooth transition to their new Microsoft 365 tenant without any disruptions.

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